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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28260 results found.

  1. GRB 090102: TAROT Calern observatory optical observations
  2. GRB 081230: GROND confirmation of the afterglow
  3. GRB 081230, Swift-BAT refined analysis
  4. GRB081230: Swift-XRT refined analysis
  5. GRB 081230 Swift/UVOT Observations
  6. GRB 081230: Enhanced Swift-XRT position
  7. GRB 081230: ROTSE-III Detection of Optical Counterpart
  8. GRB 081230: Swift detection of a burst
  9. GRB 081226C: Fermi GBM detection
  10. GRB 081228, Swift-BAT refined analysis
  11. VLA radio detection of GRB 081221
  12. GRB 081228: Swift/UVOT Upper Limits
  13. GRB 081228: Swift-XRT Team refined analysis
  14. GRB 081228: detection by GROND
  15. GRB 081228: Enhanced Swift-XRT position
  16. GRB 081228: TAROT Calern observatory optical observations
  17. GRB 081228: Swift detection of a burst
  18. VLA radio observation of GRB 081221
  19. GRB 081226B: Swift XRT and UVOT upper limits
  20. GRB 081224: Suzaku WAM observation of the prompt emission
  21. GRB 081226: Swift-XRT refined analysis
  22. GRB 081226A: Swift UVOT Upper Limits
  23. GRB 081226A: Swift-BAT refined analysis
  24. GRB 081226: GROND afterglow candidate
  25. GRB 081226: ROTSE-III Optical Limits
  26. GRB 081226: Swift detection of a possible short-hard burst
  27. GRB 080810: optical observations
  28. GRB 081211B: optical observations
  29. GRB 081224: Swift-XRT observation
  30. GRB 081222: MITSuME optical observation
  31. GRB 081224: Fermi GBM Detection & LAT Localization
  32. GRB 080810: optical observations
  33. Konus-Wind observation of GRB 081222
  34. GRB 081223: Fermi GBM detection
  35. GRB 081221: GROND observations
  36. VLA radio upper limit on GRB 081222
  37. GRB 081222: Fermi GBM observation
  38. GRB 081221: Probable host galaxy in Keck imaging
  39. GRB 081204C: Fermi GBM detection
  40. GRB 081222, Swift-BAT refined analysis
  41. GRB 081221, Swift-BAT refined analysis
  42. GRB081222 optical limit by "Pi of the Sky"
  43. GRB 081222: Swift XRT refined analysis
  44. GRB081221: Fermi GBM observation
  45. IPN triangulation of bright GRB 081215A
  46. GRB 081222: Faulkes Telescope South observations
  47. GRB 081221: Gemini-N nIR imaging
  48. GRB081222, optical observation
  49. GRB081203A: BTA observation
  50. Konus-Wind observation of GRB 081221
  51. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  52. GRB081222: REM candidate afterglow
  53. GRB 081222: Swift detection of a burst with a bright optical afterglow
  54. GRB 081221: Enhanced Swift-XRT position
  55. GRB 081221: further NOT observations
  56. GRB 081221: NOT observations
  57. GRB 081221: Swift detection of a burst
  58. GRB 081217: Fermi GBM detection
  59. GRB 081211B: Further Swift-XRT analysis
  60. GRB 081215B: Fermi GBM detection
  61. GRB 081216: Suzaku WAM observation of the prompt emission
  62. GRB 081216 : Fermi GBM observation
  63. GRB 081215A: Fermi GBM detection
  64. GRB 081118: Zadko observations
  65. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  66. GRB 0811215A: MASTER prompt optical observations
  67. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  68. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  69. Possible GRB 081211B: Swift/UVOT Upper Limits
  70. GRB 081213: Fermi GBM detection
  71. Possible GRB 081211B - Swift-XRT analysis
  72. GRB 081207: Fermi GBM detection
  73. GRB 081209: Fermi GBM detection
  74. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  75. GRB 081210, SMARTS optical/IR observations
  76. GRB 081211: Swift-BAT refined analysis
  77. GRB 081211: Swift XRT refined analysis
  78. GRB 081211: Enhanced Swift-XRT position
  79. GRB 081211: Swift detection of a burst
  80. GRB 081210: Swift-XRT refined analysis
  81. GRB081203B: optical observations
  82. GRB 081210: Enhanced Swift-XRT position
  83. GRB 081210: Swift-BAT refined analysis
  84. GRB 081210: Swift detection of a burst with optical afterglow
  85. IPN triangulation of short hard GRB 081209
  86. GRB 081203A: optical observations
  87. GRB 081206C: Fermi GBM detection
  88. Radio observation of GRB 081121 with ATCA
  89. Radio observation of GRB 081118 with ATCA
  90. GRB 081206B: Fermi GBM detection
  91. GRB 081206: Fermi GBM detection
  92. GRB 081128: afterglow observations
  93. GRB 081203B: Suzaku WAM observation of the prompt emission
  94. Radio observation of GRB 081109 with ATCA
  95. Radio observation of GRB 081104 with ATCA
  96. Radio observation of GRB 081029 with ATCA
  97. Radio observation of GRB 081008 with ATCA
  98. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  99. GRB081203A: Optical observations at Ishigaki
  100. GRB 081204: GROND Observations

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